Hydraulic rotary core-taking device



April 7, 1925.

L. J. BLACK HYDRAULIC ROTARY CORE TAKING DEVICE Filed Dec. 3, 192

IN VEN TOR.

A T TORNEY Patented Apr. 7, 1925.

UNITED STATES LEF- J'. BLACK, OF BEAUMONT, TEXAS.

HYDRAULIC ROTARY GORE-TAKING DEVICE.

Application filed December 3, 1923. SeriaLNo. 678,204.

To all whom it may concern:

Be it known that I, LEE J. BLACK, a citizen of the United States, residing at Beaumont, in the county of, Jefferson and State of Texas, have invented certain new'andwells, the same being analogous to that class.

of similar devices employed to simultaneously pierce the earth and collect a sample or core of the various formations of strata being penetrated.

The prime feature of the present invention is that it is a decided improvement on, prior devices of the same class due to the fact that it is more dependable, practical, and of such construction that an accurate and complete incohesive sample or core of the formation of the various strata is cer-' tain to be obtained when the device is extracted and brought to the surface.

More specifically speaking, another feature of the invention is the novel core taking device which is equipped with rotary disk-cutters so that more or less obstinate strata may be pierced to obtain samples such as cannot be obtained with the well known fish-tail hits such as are commonly employed in association with prior devices of this class.

Another feature and outstanding advantage of the invention is the improved method and structure for facilitating entrance and collection of the core, which result is insured by the provision of a passage in the body which is restricted in diameter at its entrance, but is of a suflicient diameter above this restricted entrance to prevent clogging as the core is pushed upwardly.

I also aim to improve upon devices of this class by preventing possible loss of the core during the period of extraction, this result being obtained by a double valve arrangement in the core receiving tube, one

' valve serving to prevent fluid from entering the tube at the top and the other valve being normall open topermit passage of the core there y, but-automatically closing as soon as the device is elevated.

Numerous other features and advantages of the invention will become evident as the description goes on. I

In the accompanying drawings forming a. part of this specification and in which like numerals are employed to. designate like parts throughout the same Fig. 1 is a side elevation of the drill body. b0Iiigure 2 is a bottom-plan view of said Figure 3 is a top plan view thereof.

Figure 4 is a central vertical sectional view taken on the line H of Fig. 1, looking in the direction ofthe arrows.

Figure 5 is a horizontal section taken on the line 5-5 of Figure 4:.

Figure 6 is an assembled view of the complete device with portions in section and elevation. I

Figure 7 is a fragmentary view of the upper portion of Figure 4, showing the valves in open position.

Referring now to the drawings in detail, we will observe that the invention comprises I a body 1, having a relatively large upper portion provided with a tapered screwthreaded part 2. Depending from the upper portion is a relatively smalltubular part constituting a barrel 3, and detachably connected with the lower end of this barrel is an extension 4. The upper portion of the body-is bored longitudinally and this bore is alined with the bore of the barrel extension. In this connection, I wish to point out, as before indicated, that the diameter of the bore of said extension is slightly smaller than that ofthe bore above it to facilitate entrance and upward passage of the core. Thus, clogging is prevented. It may also be logically set forth here that the body is provided on substantially diametrically opposite sides with integral tangentially disposed ribs 5, the lowerportions of which are bifurcated to provide mounting means for a pair of 'disk-cutters 6. For the purpose of furnishing the bearings with lubrication, a pair of small passages 7, extend thru the body and lead to the bearings. The body is also equipped with two or more larger vertical passages 8 thru which the drilling circulation or mud laden fluids pass. I

Directing attention to the upper portion of the body, it will be seen that the same is counterbored as indicated at 9, this counterbore being screw-threaded to permit a cy-- lindrical member, hereinafter referred to The upper end of the housing extends beyond the body and is internally screwthreaded for a purpose to appear later.

The opposite or lower end of the housing is counterbored as at 11 to accommodate a pair of opposed pivoted flap-valves 12. As seen more clearly in Fig. 7 these valves are substantially semi-circular in cross section so that when they are swung upwardly to inoperative position they will lie in close proximity to the wall of the cou'nterbore, thus rendering their inner faces substantially flush with the wall of themain bore or core passage. Hence, a perfectly cylindrical core may be formed due to this con: struction. However, as soon as the device is extracted, these valves close quickly and entrap the core in the receiving tube 13 which, is threaded into the upper end of the part 10.

For {the p'urpose of preventing fluid from entering the tube just described and destroyin} the natural condition of the core in its 5% rmation, I place a suitable valve 14 on the upper end of the tube. Furthermore, in order to impart rotation to the device, I connect a casing 15 to the upper threade end 2 of the aforesaid body, sufficient space being left'between the casing and the tube to permit free circulation of the mud laden fluids. The casing, of course, constitutesfthe usual drill stem.

In ractice, the device is set into rotation in the usual way by conventional driving means and the cutting disks cause it to penetrate the earth. Obviously, as the device passes downwardly, a sample of the formation being pierced enters and is retained in the receiving tube. As the intake of the. device is specially constructed,

the core enters freely in its natural state and is trapped by the valves, and when the tool isextracted, an accurate and incohesive sample is had for analyzing above the surface. The rotating disk cutters insure proper descent of the tool. Hence, it is evident that I have evolved and produced an extremely practical and very novel device for simultaneously drilling and taking a core.

While I have shown the relative proportions of the several details of the device, I wish it to be known that such showing is not to be regarded as controlling, for they may be varied within the scope of the claims to meet any and all requirements.

1. A device of the class described comprising a body having a longitudinal bore extending therethrough, the upper end of which is increased in diameter and screwthreaded, ribs on opposite sides of the body extending tangentially therefrom in opposite directions, rotary disk-cutters carried by said ribs, the lower portion of said body being reduced in diameter equipped with a renewable extension disposed beyond the peripheries of said cut-v ters, a valve housing fitted into the enlarged upper portion of said bore, and a pair of flap-valves pivoted in the housing.

2. A device of the class described eomprising a body having a-longitudinal bore extending therethrough, the'upper end of which is increasedin diameter and screwthreaded, ribs on opposite sides of the body extending tangentially therefrom in opposite directions, rotary disk cutters carried by said ribs, the lower portion of said body and beingbeing equipped with a renewable extension disposed beyond the peripheries of said cutters. and being reduced in diameter, a valve housing fitted into the enlarged upper portion of said bore, valves pivoted in said housing, and valved core collecting and retaining means attached to said housing.

In testimony whereof I hereunto aflix my signature.

LEE J. BLACK. 

